An NG tube is used to:

• A. Insert a tube into a nostril to the stomach to remove fluids, monitor digestion, administer meds or nutrients, or obtain specimens
• B. Provide airway support during anesthesia
• C. Measure ventricular pressures
• D. Drain pleural fluid

Answer: (A)

The main idea is that a nasogastric tube provides access from the nose into the stomach for gastric drainage, medication administration, nutrition when the patient cannot swallow, and obtaining gastric samples. This aligns with inserting a tube through a nostril down to the stomach to remove fluids, monitor digestion, administer meds or nutrients, or obtain specimens. The other options involve different devices and purposes: airway support during anesthesia uses an airway device such as an endotracheal tube, measuring ventricular pressures requires a cardiac or vascular catheter, and draining pleural fluid uses a chest tube.